Casa Calvet, which construction Gaudí began in 1898, was quite a challenge for the architect - mainly because the building had to be fit into a row of already existing buildings. House served different purposes - the cellars and ground floor were occupied by stores and offices, the higher floors - eight individual flats.

To fulfill his task,Gaudí constructed a very simple building with nearly symmetrical profile. Only in the upper parts he expressed his creativity - from the top of the house three martyrs are "watching" the passers-by (ther is also a practical lift for pulling up furniture). In comparison with neighboring large and simple houses Casa Calvet seems to be much larger. Architect received such an effect by the top frame and many round balconies.

Casa Milà (also known as La Pedrera) -Milà's house - is a building in Barcelona, created in the years 1906-1910. Located on the corner of Passeig de Grácia and Provença, in the middle of the city.
It was designed by Antoni Gaudí and performed for the entrepreneur Pere Milà and his wife . It is the most mature and last  "secular" project of the architect. Casa Milà, as Gaudí wanted, was supposed to be a response on the lack of interesting buildings in the city. Due to the appearance (the building looks like a huge rock block) habitats of Barcelona called it La Pedrera, which means Quarry.

Casa Batlló is a mansion situated on Passeig de Gracia 43 in Barcelona that Antoni Gaudí restored on behalf of its owner, Josep Batlló Casanova. Originally the owner wanted to demolish the thirty-years-old house, which was designed by Emilio Sala Cortés and build a completely new one, but Gaudí convinced him to leave the original building and concentrate on giving it a completely new and fresh form.

The building is located in the affluent neighborhood of Barcelona and was originally designed for the middle class. It was built in 1877, and the reconstruction took place between 1905 to 1907. Gaudí, who controlled the renovation work by himself (he was standing on the street all the time), gave the building a very unusual appearance, as he did for all of his buildings.

The Güell Palace is a magnificent building designed by the famous and amazing Spanish architect Antoni Gaudí for the Catalan tycoon - Eusebio Güell, who wanted to have a new house in Barcelona. Implementation of the project was completed in 1890 and actually was the only building that Gaudi fully completed. The roof, or rather lovely terrace are covered with decorated with glass and ceramic tiles chimneys and headers. Three-storey living room is covered with cupola referring to the architecture of Islam, symmetrically distributed holes are making the illusion of stars.In 1984, the Güell Palace was inscribed on the UNESCO List for his incredible, unique character and great impact on technology of construction in later times.